Force running GC on the worker thread before the unit test exits

For the main thread we seem to always run
v8::Isolate::RequestGarbageCollectionForTesting but it's
not the case on the worker thread, which seems to cause leaks
on the context object.

BUG=526424

Review URL: https://codereview.chromium.org/1316233004

git-svn-id: svn://svn.chromium.org/blink/trunk@201601 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/workers/WorkerThreadTest.cpp

@@ -9,10 +9,12 @@
 #include "core/workers/WorkerReportingProxy.h"
 #include "core/workers/WorkerThreadStartupData.h"
 #include "platform/NotImplemented.h"
+#include "platform/heap/Heap.h"
 #include "public/platform/WebScheduler.h"
 #include "public/platform/WebWaitableEvent.h"
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
+#include <v8.h>
 
 using testing::_;
 using testing::AtMost;
@@ -109,6 +111,12 @@ public:
     {
         return *m_thread;
     }
+    void willDestroyIsolate() override
+    {
+        v8::Isolate::GetCurrent()->RequestGarbageCollectionForTesting(v8::Isolate::kFullGarbageCollection);
+        Heap::collectAllGarbage();
+        WorkerThread::willDestroyIsolate();
+    }
 
     MOCK_METHOD1(doIdleGc, bool(double deadlineSeconds));
 

third_party/WebKit/Source/modules/compositorworker/CompositorWorkerManagerTest.cpp

@@ -14,10 +14,12 @@
 #include "modules/compositorworker/CompositorWorkerThread.h"
 #include "platform/NotImplemented.h"
 #include "platform/ThreadSafeFunctional.h"
+#include "platform/heap/Heap.h"
 #include "platform/testing/UnitTestHelpers.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebWaitableEvent.h"
 #include <gtest/gtest.h>
+#include <v8.h>
 
 namespace blink {
 namespace {
@@ -49,6 +51,12 @@ private:
         if (m_v8TerminationCallback)
             (*m_v8TerminationCallback)();
     }
+    void willDestroyIsolate() override
+    {
+        v8::Isolate::GetCurrent()->RequestGarbageCollectionForTesting(v8::Isolate::kFullGarbageCollection);
+        Heap::collectAllGarbage();
+        CompositorWorkerThread::willDestroyIsolate();
+    }
 
     WebWaitableEvent* m_startEvent;
     OwnPtr<Function<void()>> m_v8TerminationCallback;